Small question about acceleration

Phinney · April 4th, 2011, 05:12 PM

I am asking about my 1988 Thunderbird Turbocoupe. After my recent rebuild I have noticed a change in the throttle response (duh!) and I am a little confused. Before the rebuild, I had to floor it to WOT to really build boost. Now, I only open the throttle a hair, and no more, and it boosts right up to 15 or so and the car pulls hard.

Now, if I push the pedal and further, even halfway down, the car makes a hell of a lot of air noise like a bus and feels like its dragging and anchor, although it doesn't choke or sputter, just slower acceleration.

Because of this, its hard for me to drive this car without boosting through every gear. Ive checked the throttle and it opens properly, and the point where my car pulls the hardest is indeed just a small opening with the car off.

With my limited knowledge of turbo cars or performance engines in general, It makes me believe that with the throttle opened too much, its getting all that air, but not enough fuel. Im waiting for my exhaust to arrive in the mail, so my wide-band is not installed yet to confirm this. Also having a hard time finding the correct fitting to attach my fuel pressure gauge so I cant check on pressure either.

Mikel89us · April 4th, 2011, 10:52 PM

Im not sure if it would make that kind of difference, but have you double or triple checked your cam timing?

Phinney · April 5th, 2011, 02:45 PM

Yeah cam timing is spot on

03 R Code · April 6th, 2011, 02:06 AM

Do you have an external wastegate or factory internal?

With the fuel pressure gauge just head down to ACE hardware. They are sure to have the fitting you need. I actually just spent $6 there 2 days ago to get the fittings needed for my new FPG. Found out the old gauge was not reading correctly and it was actually set at 60psi of fuel!!! That's a big problem for sure!

Phinney · April 6th, 2011, 08:21 AM

still has the factory integral wastegate now. That sounds good, the last one i ordered off ebay and it was the wrong fitting, Ill try ACE today, thanks!

Phinney · April 6th, 2011, 03:00 PM

Dunno how I missed it before, but the clutch is slipping in a major way under boost. It still pulls harder than it ever did before. The clutch was brand new when rebuilt the engine, but it is just a stock replacement.

This is my first manual transmission. Any advice on what I need to do to upgrade the clutch? I just need to know what all parts I need to buy, the installation I can figure out.

The power is only going to continue to increase so I need to fix this quick like!

03 R Code · April 7th, 2011, 01:24 AM

Stinger sells SPEC clutches, each with a description of how much power it will hold if you need that. I've got a SPEC stage 2 on my car put on by the previous owner, although I'm not super high powered with my car, that clutch has held with 22psi of boost.

April 4th, 2011, 05:12 PM	#1
Phinney Regular 2004 Mustang Convertible Join Date: Apr 2009 Location: Fort Lauderdale, FL Posts: 156 iTrader: 0 reviews	Small question about acceleration I am asking about my 1988 Thunderbird Turbocoupe. After my recent rebuild I have noticed a change in the throttle response (duh!) and I am a little confused. Before the rebuild, I had to floor it to WOT to really build boost. Now, I only open the throttle a hair, and no more, and it boosts right up to 15 or so and the car pulls hard. Now, if I push the pedal and further, even halfway down, the car makes a hell of a lot of air noise like a bus and feels like its dragging and anchor, although it doesn't choke or sputter, just slower acceleration. Because of this, its hard for me to drive this car without boosting through every gear. Ive checked the throttle and it opens properly, and the point where my car pulls the hardest is indeed just a small opening with the car off. With my limited knowledge of turbo cars or performance engines in general, It makes me believe that with the throttle opened too much, its getting all that air, but not enough fuel. Im waiting for my exhaust to arrive in the mail, so my wide-band is not installed yet to confirm this. Also having a hard time finding the correct fitting to attach my fuel pressure gauge so I cant check on pressure either. __________________ 2004 Convertible - SOLD 1999 Coupe - SOLD 1966 Coupe - SOLD 1987 TurboCoupe - Cut in prices! 1970 Coupe - Soon to be 140 Turbo! 1984 El Camino Conquista - moving truck 2011 Convertible V6 Base 2012 Coupe GT Premium 5.0 Baby!

April 4th, 2011, 10:52 PM	#2
Mikel89us Regular 1991 Mustang 2.3L 11:42 @ 61 in the 1/8th Join Date: Feb 2011 Location: Logansport, IN Posts: 362 iTrader: 0 reviews	Im not sure if it would make that kind of difference, but have you double or triple checked your cam timing? __________________ 1991 Mustang LX 2.3L 5 Speed convert 1989 Ranger 4X4 2.3L 5 Speed Entire turbo kit waiting to be used again.

April 5th, 2011, 02:45 PM	#3
Phinney Regular 2004 Mustang Convertible Join Date: Apr 2009 Location: Fort Lauderdale, FL Posts: 156 iTrader: 0 reviews	Yeah cam timing is spot on __________________ 2004 Convertible - SOLD 1999 Coupe - SOLD 1966 Coupe - SOLD 1987 TurboCoupe - Cut in prices! 1970 Coupe - Soon to be 140 Turbo! 1984 El Camino Conquista - moving truck 2011 Convertible V6 Base 2012 Coupe GT Premium 5.0 Baby!

April 6th, 2011, 02:06 AM	#4
03 R Code MM Fanatic unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 3,103 iTrader: 0 reviews	Do you have an external wastegate or factory internal? With the fuel pressure gauge just head down to ACE hardware. They are sure to have the fitting you need. I actually just spent $6 there 2 days ago to get the fittings needed for my new FPG. Found out the old gauge was not reading correctly and it was actually set at 60psi of fuel!!! That's a big problem for sure! __________________ Political correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

April 6th, 2011, 08:21 AM	#5
Phinney Regular 2004 Mustang Convertible Join Date: Apr 2009 Location: Fort Lauderdale, FL Posts: 156 iTrader: 0 reviews	still has the factory integral wastegate now. That sounds good, the last one i ordered off ebay and it was the wrong fitting, Ill try ACE today, thanks! __________________ 2004 Convertible - SOLD 1999 Coupe - SOLD 1966 Coupe - SOLD 1987 TurboCoupe - Cut in prices! 1970 Coupe - Soon to be 140 Turbo! 1984 El Camino Conquista - moving truck 2011 Convertible V6 Base 2012 Coupe GT Premium 5.0 Baby!

April 6th, 2011, 03:00 PM	#6
Phinney Regular 2004 Mustang Convertible Join Date: Apr 2009 Location: Fort Lauderdale, FL Posts: 156 iTrader: 0 reviews	Dunno how I missed it before, but the clutch is slipping in a major way under boost. It still pulls harder than it ever did before. The clutch was brand new when rebuilt the engine, but it is just a stock replacement. This is my first manual transmission. Any advice on what I need to do to upgrade the clutch? I just need to know what all parts I need to buy, the installation I can figure out. The power is only going to continue to increase so I need to fix this quick like! __________________ 2004 Convertible - SOLD 1999 Coupe - SOLD 1966 Coupe - SOLD 1987 TurboCoupe - Cut in prices! 1970 Coupe - Soon to be 140 Turbo! 1984 El Camino Conquista - moving truck 2011 Convertible V6 Base 2012 Coupe GT Premium 5.0 Baby!

April 7th, 2011, 01:24 AM	#7
03 R Code MM Fanatic unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 3,103 iTrader: 0 reviews	Stinger sells SPEC clutches, each with a description of how much power it will hold if you need that. I've got a SPEC stage 2 on my car put on by the previous owner, although I'm not super high powered with my car, that clutch has held with 22psi of boost. __________________ Political correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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